Allowance for Loan Losses - Activity in Allowance for Loan Losses (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance	$ 33,505	$ 28,924	$ 32,423	$ 27,122
Provision for Loan Losses	2,251	5,774	6,199	9,388
Charge- Offs	(2,592)	(1,145)	(6,715)	(3,964)
Recoveries	481	348	1,800	1,476
TDR Allowance Adjustments	(40)	(36)	(102)	(157)
Ending Balance	33,605	33,865	33,605	33,865
Construction & land development
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance	2,243	2,287	2,233	1,642
Provision for Loan Losses	(395)	(221)	(391)	414
Charge- Offs	0	0	0	0
Recoveries	6	3	13	13
TDR Allowance Adjustments	0	0	(1)	0
Ending Balance	1,854	2,069	1,854	2,069
Commercial real estate
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance	11,870	9,126	11,112	9,285
Provision for Loan Losses	1,368	4,191	1,560	3,826
Charge- Offs	(232)	(1)	(248)	(15)
Recoveries	10	18	622	268
TDR Allowance Adjustments	(19)	(16)	(49)	(46)
Ending Balance	12,997	13,318	12,997	13,318
Residential real estate
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance	7,508	8,850	7,775	7,131
Provision for Loan Losses	87	(1,279)	(276)	(78)
Charge- Offs	(38)	(6)	(102)	(33)
Recoveries	52	99	242	733
TDR Allowance Adjustments	(20)	(19)	(50)	(108)
Ending Balance	7,589	7,645	7,589	7,645
Commercial and financial
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance	8,912	7,102	8,585	7,297
Provision for Loan Losses	769	1,739	3,736	3,639
Charge- Offs	(1,625)	(842)	(4,450)	(2,985)
Recoveries	295	163	480	211
TDR Allowance Adjustments	0	0	0	0
Ending Balance	8,351	8,162	8,351	8,162
Consumer
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance	2,972	1,559	2,718	1,767
Provision for Loan Losses	422	1,344	1,570	1,587
Charge- Offs	(697)	(296)	(1,915)	(931)
Recoveries	118	65	443	251
TDR Allowance Adjustments	(1)	(1)	(2)	(3)
Ending Balance	$ 2,814	$ 2,671	$ 2,814	$ 2,671